Definition of loathsome adjective from the Oxford Advanced Learner's Dictionary

 

loathsome

 adjective
adjective
BrE BrE//ˈləʊðsəm//
 
; NAmE NAmE//ˈloʊðsəm//
 
(formal) Disgust
 
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extremely unpleasant; disgusting synonym repulsive The police described it as one of the most loathsome crimes of recent years. Police described the murderer as ‘a foul and loathsome beast’. This was a loathsome crime against innocent people. See related entries: Disgust Word Origin Middle English: from archaic loath ‘disgust, loathing’ + -some.
See the Oxford Advanced American Dictionary entry: loathsome